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  • Interpreting IEEE Std 519 and Meeting its Harmonic Limits in VFD Applications (.pdf)
    IEEE Std 519 was first introduced in 1981 to provide direction on dealing with harmonics introduced by static power converters and other nonlinear loads so that power quality problems could be averted. It is being applied by consulting engineers and enforced by Utilities more frequently in recent
  • Cable Solutions for Servo and Variable Frequency Drives
    . This article discusses different drive system problems, such as electromagnetic interference, electrical surge and leakage. It shows how shielded motor supply cables perform in electromagnetic compatibility tests, and how cable design and materials provide solutions to VFD problems.
  • Variable Speed Drives and Centrifuges for Zone 1 Hazardous Areas (.pdf)
    Using a variable frequency drive (VFD) provides a standard solution to get the top performance of machines in many applications in the process industry. Today, there is no solution to install frequency converters inside the hazardous area. This limits the functionality and the ability for a compact
  • Understanding Electronic Motor Drives
    . For instance, take a simple application of a fixed-speed motor driving a fan. Replacing a three-phase motor starter with variablefrequency drive (VFD) permits the fan to operate at variable speeds. One benefit is energy savings,